/Engine/Source/Runtime/Slate/Public/Framework/Application/SlateUser.h
void NotifyPointerReleased ( const [FPointerEvent](API\Runtime\SlateCore\Input\FPointerEvent) & PointerEvent, const [FWidgetPath](API\Runtime\SlateCore\Layout\FWidgetPath) & WidgetsUnderCursor, [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [FDragDropOperation](API\Runtime\SlateCore\Input\FDragDropOperation) > DroppedContent, bool bWasHandled )